quasar | 1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28

Analysis

max time kernel
95s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
10-01-2025 14:08

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General

Target

QUOTATION-9044456778.pdf83kb.com.exe
Size

3.6MB
MD5

902afcb6d3f905ff4603200341f02874
SHA1

473fad4ac13e9c8b6b80d17ae3fb658b28d1cd47
SHA256

1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28
SHA512

e405ec77372dbf367c873d3531fc6455c44c4d185bd1a0b60c9314ea21b1b51f72818503366efaa8d2d322c7819763986a837e06845a0f81eacb6e4c1a98ec3c
SSDEEP

49152:Bg6eXlKawrTTN8CaimN0G0LI1yfuJDqHkN0IrmRZiLTqK2W3rcKmUd5mgo:BKVtw7N1aim/0pMtNrmRZu32W+Kgj

Score

10^/10

quasar code discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

CODE

twart.myfirewall.org:9792

rency.ydns.eu:5287

wqo9.firewall-gateway.de:8841

code1.ydns.eu:5287

wqo9.firewall-gateway.de:9792

Mutex

025351e291-5d1041-4fa37-932c7-869aeiQec514992

Attributes

encryption_key
3145298725BA5E0DD56E87FFE3F8898EA81E6EDA
install_name
Exccelworkbook.exe
log_directory
Logs
reconnect_delay
6000
startup_key
pdfdocument
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar family
quasar

Quasar payload 1 IoCs

resource	yara_rule
behavioral2/memory/5100-12-0x0000000000400000-0x0000000000724000-memory.dmp	family_quasar

Executes dropped EXE 2 IoCs

pid	Process
1504	Exccelworkbook.exe
1132	Exccelworkbook.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2428 set thread context of 5100	2428	QUOTATION-9044456778.pdf83kb.com.exe	93
PID 1504 set thread context of 1132	1504	Exccelworkbook.exe	106

System Location Discovery: System Language Discovery 1 TTPs 6 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	QUOTATION-9044456778.pdf83kb.com.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	QUOTATION-9044456778.pdf83kb.com.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Exccelworkbook.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Exccelworkbook.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
468	schtasks.exe
3416	schtasks.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
2428	QUOTATION-9044456778.pdf83kb.com.exe
2428	QUOTATION-9044456778.pdf83kb.com.exe
2428	QUOTATION-9044456778.pdf83kb.com.exe
2428	QUOTATION-9044456778.pdf83kb.com.exe
2428	QUOTATION-9044456778.pdf83kb.com.exe
2428	QUOTATION-9044456778.pdf83kb.com.exe
2428	QUOTATION-9044456778.pdf83kb.com.exe
2428	QUOTATION-9044456778.pdf83kb.com.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2428	QUOTATION-9044456778.pdf83kb.com.exe
Token: SeDebugPrivilege	5100	QUOTATION-9044456778.pdf83kb.com.exe
Token: SeDebugPrivilege	1132	Exccelworkbook.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1132	Exccelworkbook.exe

Suspicious use of WriteProcessMemory 37 IoCs

description	pid	Process	procid_target
PID 2428 wrote to memory of 2132	2428	QUOTATION-9044456778.pdf83kb.com.exe	89
PID 2428 wrote to memory of 2132	2428	QUOTATION-9044456778.pdf83kb.com.exe	89
PID 2428 wrote to memory of 2132	2428	QUOTATION-9044456778.pdf83kb.com.exe	89
PID 2428 wrote to memory of 1516	2428	QUOTATION-9044456778.pdf83kb.com.exe	90
PID 2428 wrote to memory of 1516	2428	QUOTATION-9044456778.pdf83kb.com.exe	90
PID 2428 wrote to memory of 1516	2428	QUOTATION-9044456778.pdf83kb.com.exe	90
PID 2428 wrote to memory of 3064	2428	QUOTATION-9044456778.pdf83kb.com.exe	91
PID 2428 wrote to memory of 3064	2428	QUOTATION-9044456778.pdf83kb.com.exe	91
PID 2428 wrote to memory of 3064	2428	QUOTATION-9044456778.pdf83kb.com.exe	91
PID 2428 wrote to memory of 4988	2428	QUOTATION-9044456778.pdf83kb.com.exe	92
PID 2428 wrote to memory of 4988	2428	QUOTATION-9044456778.pdf83kb.com.exe	92
PID 2428 wrote to memory of 4988	2428	QUOTATION-9044456778.pdf83kb.com.exe	92
PID 2428 wrote to memory of 5100	2428	QUOTATION-9044456778.pdf83kb.com.exe	93
PID 2428 wrote to memory of 5100	2428	QUOTATION-9044456778.pdf83kb.com.exe	93
PID 2428 wrote to memory of 5100	2428	QUOTATION-9044456778.pdf83kb.com.exe	93
PID 2428 wrote to memory of 5100	2428	QUOTATION-9044456778.pdf83kb.com.exe	93
PID 2428 wrote to memory of 5100	2428	QUOTATION-9044456778.pdf83kb.com.exe	93
PID 2428 wrote to memory of 5100	2428	QUOTATION-9044456778.pdf83kb.com.exe	93
PID 2428 wrote to memory of 5100	2428	QUOTATION-9044456778.pdf83kb.com.exe	93
PID 2428 wrote to memory of 5100	2428	QUOTATION-9044456778.pdf83kb.com.exe	93
PID 5100 wrote to memory of 468	5100	QUOTATION-9044456778.pdf83kb.com.exe	94
PID 5100 wrote to memory of 468	5100	QUOTATION-9044456778.pdf83kb.com.exe	94
PID 5100 wrote to memory of 468	5100	QUOTATION-9044456778.pdf83kb.com.exe	94
PID 5100 wrote to memory of 1504	5100	QUOTATION-9044456778.pdf83kb.com.exe	96
PID 5100 wrote to memory of 1504	5100	QUOTATION-9044456778.pdf83kb.com.exe	96
PID 5100 wrote to memory of 1504	5100	QUOTATION-9044456778.pdf83kb.com.exe	96
PID 1504 wrote to memory of 1132	1504	Exccelworkbook.exe	106
PID 1504 wrote to memory of 1132	1504	Exccelworkbook.exe	106
PID 1504 wrote to memory of 1132	1504	Exccelworkbook.exe	106
PID 1504 wrote to memory of 1132	1504	Exccelworkbook.exe	106
PID 1504 wrote to memory of 1132	1504	Exccelworkbook.exe	106
PID 1504 wrote to memory of 1132	1504	Exccelworkbook.exe	106
PID 1504 wrote to memory of 1132	1504	Exccelworkbook.exe	106
PID 1504 wrote to memory of 1132	1504	Exccelworkbook.exe	106
PID 1132 wrote to memory of 3416	1132	Exccelworkbook.exe	107
PID 1132 wrote to memory of 3416	1132	Exccelworkbook.exe	107
PID 1132 wrote to memory of 3416	1132	Exccelworkbook.exe	107

C:\Users\Admin\AppData\Local\Temp\QUOTATION-9044456778.pdf83kb.com.exe
"C:\Users\Admin\AppData\Local\Temp\QUOTATION-9044456778.pdf83kb.com.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2428
- C:\Users\Admin\AppData\Local\Temp\QUOTATION-9044456778.pdf83kb.com.exe
  "C:\Users\Admin\AppData\Local\Temp\QUOTATION-9044456778.pdf83kb.com.exe"
  2⤵
  PID:2132
- C:\Users\Admin\AppData\Local\Temp\QUOTATION-9044456778.pdf83kb.com.exe
  "C:\Users\Admin\AppData\Local\Temp\QUOTATION-9044456778.pdf83kb.com.exe"
  2⤵
  PID:1516
- C:\Users\Admin\AppData\Local\Temp\QUOTATION-9044456778.pdf83kb.com.exe
  "C:\Users\Admin\AppData\Local\Temp\QUOTATION-9044456778.pdf83kb.com.exe"
  2⤵
  PID:3064
- C:\Users\Admin\AppData\Local\Temp\QUOTATION-9044456778.pdf83kb.com.exe
  "C:\Users\Admin\AppData\Local\Temp\QUOTATION-9044456778.pdf83kb.com.exe"
  2⤵
  PID:4988
- C:\Users\Admin\AppData\Local\Temp\QUOTATION-9044456778.pdf83kb.com.exe
  "C:\Users\Admin\AppData\Local\Temp\QUOTATION-9044456778.pdf83kb.com.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:5100
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "pdfdocument" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe" /rl HIGHEST /f
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:468
- - C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1504
  - - C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:1132
    - - C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "pdfdocument" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe" /rl HIGHEST /f
        5⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:3416

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\QUOTATION-9044456778.pdf83kb.com.exe.log

Filesize
1KB

MD5
8ec831f3e3a3f77e4a7b9cd32b48384c

SHA1
d83f09fd87c5bd86e045873c231c14836e76a05c

SHA256
7667e538030e3f8ce2886e47a01af24cb0ea70528b1e821c5d8832c5076cb982

SHA512
26bffa2406b66368bd412bf25869a792631455645992cdcade2dbc13a2e56fb546414a6a9223b94c96c38d89187add6678d4779a88b38b0c9e36be8527b213c3

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe

Filesize
3.6MB

MD5
902afcb6d3f905ff4603200341f02874

SHA1
473fad4ac13e9c8b6b80d17ae3fb658b28d1cd47

SHA256
1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28

SHA512
e405ec77372dbf367c873d3531fc6455c44c4d185bd1a0b60c9314ea21b1b51f72818503366efaa8d2d322c7819763986a837e06845a0f81eacb6e4c1a98ec3c

Download Submit
memory/1132-37-0x0000000007D70000-0x0000000007DD6000-memory.dmp

Filesize
408KB

Download
memory/1132-36-0x0000000007CC0000-0x0000000007CFC000-memory.dmp

Filesize
240KB

Download
memory/1132-35-0x0000000006830000-0x0000000006842000-memory.dmp

Filesize
72KB

Download
memory/1132-32-0x0000000006670000-0x0000000006722000-memory.dmp

Filesize
712KB

Download
memory/1132-31-0x0000000006400000-0x0000000006450000-memory.dmp

Filesize
320KB

Download
memory/1132-30-0x0000000006860000-0x0000000006E78000-memory.dmp

Filesize
6.1MB

Download
memory/1504-29-0x00000000750B0000-0x0000000075860000-memory.dmp

Filesize
7.7MB

Download
memory/1504-25-0x00000000750B0000-0x0000000075860000-memory.dmp

Filesize
7.7MB

Download
memory/1504-24-0x00000000750B0000-0x0000000075860000-memory.dmp

Filesize
7.7MB

Download
memory/2428-7-0x00000000069D0000-0x0000000006D6A000-memory.dmp

Filesize
3.6MB

Download
memory/2428-5-0x0000000005840000-0x000000000584A000-memory.dmp

Filesize
40KB

Download
memory/2428-1-0x00000000008E0000-0x0000000000C84000-memory.dmp

Filesize
3.6MB

Download
memory/2428-2-0x0000000005BB0000-0x0000000006154000-memory.dmp

Filesize
5.6MB

Download
memory/2428-16-0x00000000750B0000-0x0000000075860000-memory.dmp

Filesize
7.7MB

Download
memory/2428-3-0x0000000005530000-0x00000000055C2000-memory.dmp

Filesize
584KB

Download
memory/2428-10-0x00000000750B0000-0x0000000075860000-memory.dmp

Filesize
7.7MB

Download
memory/2428-9-0x00000000750BE000-0x00000000750BF000-memory.dmp

Filesize
4KB

Download
memory/2428-11-0x0000000009110000-0x0000000009478000-memory.dmp

Filesize
3.4MB

Download
memory/2428-8-0x0000000006D90000-0x0000000006DAC000-memory.dmp

Filesize
112KB

Download
memory/2428-0-0x00000000750BE000-0x00000000750BF000-memory.dmp

Filesize
4KB

Download
memory/2428-6-0x0000000005900000-0x000000000599C000-memory.dmp

Filesize
624KB

Download
memory/2428-4-0x00000000750B0000-0x0000000075860000-memory.dmp

Filesize
7.7MB

Download
memory/5100-23-0x00000000750B0000-0x0000000075860000-memory.dmp

Filesize
7.7MB

Download
memory/5100-17-0x00000000750B0000-0x0000000075860000-memory.dmp

Filesize
7.7MB

Download
memory/5100-12-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/5100-15-0x00000000750B0000-0x0000000075860000-memory.dmp

Filesize
7.7MB

Download